Diff: main.cpp

Revision:

1:b7f576b50a32

Parent:

0:00acc05bf822

--- a/main.cpp	Tue May 14 03:08:44 2019 +0000
+++ b/main.cpp	Tue May 14 03:20:59 2019 +0000
@@ -6,27 +6,130 @@
 #include "mbed.h"
 #include "stats_report.h"
 
-DigitalOut led1(LED1);
+#define ADT7420 0x48
+
+#define RESET_REG 0x2F
+#define TEMP_REG 0x00
+#define ID_REG 0x0B
+
 
-#define SLEEP_TIME                  500 // (msec)
-#define PRINT_AFTER_N_LOOPS         20
+DigitalOut led1(LED1);
+DigitalOut sensor(D8);
+
+I2C Myi2c(I2C_SDA, I2C_SCL);
+
+Serial pc(USBTX, USBRX);
+
+void ADT7420_reset(void);
+char ADT7420_GetID(void);
+int ADT7420_GetTemp(void);
 
-// main() runs in its own thread in the OS
-int main()
-{
-    SystemReport sys_state( SLEEP_TIME * PRINT_AFTER_N_LOOPS /* Loop delay time in ms */);
+int main() {
+    float status;
+    int res;
+    sensor=1;
+    //configure for UART
+    pc.baud(115200);
+    pc.printf("I2C ADT7420 Demo\n");
+   
+    //configure for I2C @100KHz
+    //Myi2c.init();
+    Myi2c.frequency(10000);
+   
+    //configure for ADT7420
+    Myi2c.lock();
+    pc.printf("[RESET ] ADT7420\n"); 
+    ADT7420_reset();
+    wait(0.5);
+
+    pc.printf("[CHECK ID] ADT7420\n"); 
+    ADT7420_GetID();
 
-    int count = 0;
+    
     while (true) {
-        // Blink LED and wait 0.5 seconds
-        led1 = !led1;
-        wait_ms(SLEEP_TIME);
+        led1 = 0;
+        
+        pc.printf("[Get Temp] ADT7420\n"); 
+        res = ADT7420_GetTemp();
+        
+        if(res & 0x1000)
+        {
+            status = (float)(res * 0.0625 * -1.0);
+            
+        }
+        else
+        {
+            status = (float)(res * 0.0625);
+        }
+        
+        pc.printf("Current Temp %.4f C\n", status);
+            
+        wait(0.5);
+        led1 = 1;
+        wait(0.5);
+    }
+    
+}
 
-        if ((0 == count) || (PRINT_AFTER_N_LOOPS == count)) {
-            // Following the main thread wait, report on the current system status
-            sys_state.report_state();
-            count = 0;
-        }
-        ++count;
+void ADT7420_reset(void)
+{
+    char cmd_reset;
+    cmd_reset = RESET_REG;
+    Myi2c.write(ADT7420);
+    if(Myi2c.write(0xFF))
+    {
+        pc.printf("Ack \n");
+    }
+    else
+    {
+        pc.printf("Nack \n");
+    }
+    
+    Myi2c.write(ADT7420);
+    if(Myi2c.write(cmd_reset))
+    {
+        pc.printf("Reset Done\n");
+    }
+    else
+    {
+        pc.printf("Reset Failure\n");
     }
 }
+    
+char ADT7420_GetID(void)
+{
+    char cmd_id, read_val;
+    int sts;
+    cmd_id=ID_REG;
+    //Myi2c.write(ADT7420, &cmd_id, 1, 0);
+    sts = Myi2c.read(ADT7420, &cmd_id, 1, 0);
+    if(sts==0)
+    {
+        pc.printf("ID ACK\n");
+    }
+    else
+    {
+        pc.printf("ID NACK\n");
+        pc.printf("Return Value STS %d \n", sts);
+    }
+    Myi2c.stop();
+    pc.printf("ID REG %02x\n", cmd_id);
+    return cmd_id;
+}
+
+int ADT7420_GetTemp(void)
+{
+    char cmd_temp[1], read_val[2];
+    int temp=0;
+    cmd_temp[0]=TEMP_REG;
+    Myi2c.start();
+    Myi2c.write(ADT7420, cmd_temp, 2);
+    wait(0.2);
+    Myi2c.read(ADT7420, read_val, 3);
+    pc.printf("Temp Upper %02x\n", read_val[0]);
+    pc.printf("Temp Lower %02x\n", read_val[1]);
+    
+    temp = (int)((read_val[0] << 8) | read_val[1]);
+    temp >>= 3;
+    return temp;
+}